IR Communication by using PT2248/PT2249A

Discussion in 'Bob & Don's Electronics Forum' started by munhann, Jul 6, 2011.

  1. DonL

    DonL Jack of all trades Master of one

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    No a cascaded emitter follower uses the same type of transistor, Typically 2 NPNs, I do believe.

    It is a complementary pair.

    I personally do not like to direct couple transistors, I would have put a 1K resistor on the base of Q2.
    But that is a mater of personal preference.

    With a limiting resistor at least if one transistor gos bad, It don't take out the other.
    Then you have to add more smoke, because it all gets let out. lol


    I hope You are having a enjoyable Weekend.


    DonL
    Last edited: Jul 9, 2011
  2. BobL43

    BobL43 DIY Senior Member

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    Just finished cutting the grass, so now its time to cool off.

    Factory smoke is hard to find these days!
  3. DonL

    DonL Jack of all trades Master of one

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    I wonder what ever happened to this IR system ?

    Did you get it working munhann ?


    DonL
  4. BobL43

    BobL43 DIY Senior Member

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    So munhann?> you out there somewhere?
  5. PipeInspection

    PipeInspection New Member

    Messages:
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    Location:
    New Jersey
    Realize this post is old. I'm new here and wondering if anyone has plans to Built a 512 Hz Transmitter. I found plans to build a Transmitter Tracker, but not sure how to turn it down to 512.

    512 is AM correct?

    Thanks in advance,

    Paul
  6. LLigetfa

    LLigetfa DIYer, not in the trades

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    NW Ontario, Canada
    AM as in Amplitude Modulation? It is within the human vocal range. Middle C on the piano is 256 Hz.
  7. DonL

    DonL Jack of all trades Master of one

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    Depending on the bandwidth it can be am/fm/cw/ssb or whatever you design it for. I would think CW is the norm, if you plan to use it as a Pipe locator.

    512 HZ is in the Audio range , so why not just use a audio generator / or a 512 HZ tape recording and a speaker ?
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